fix: Windows support & cross-platform architecture

Major fixes for Windows portable version:

1. **Fixed critical bugs:**
   - Replace Unix /dev/null with Windows nul in all .bat files
   - Unified config path to data/.openclaw/openclaw.json
   - Fixed cross-platform node_modules compatibility issue

2. **Implemented separated core directories:**
   - app/core-mac/ for Mac dependencies
   - app/core-win/ for Windows dependencies
   - Prevents cross-platform file system conflicts
   - Shared data/ directory for configs and memory

3. **Enhanced setup.sh:**
   - Now downloads both Mac and Windows Node.js runtimes
   - Ensures U-Claw works on both platforms after setup

4. **Added diagnostic tools:**
   - Windows-Diagnose.bat for troubleshooting
   - Mac-Diagnose.command for troubleshooting
   - Auto-generates diagnostic-log.txt

5. **Improved user experience:**
   - Added Welcome.html - Simple 3-step guide in Chinese
   - All scripts updated to use platform-specific core directories
   - Better error messages and user guidance

Files modified:
- portable/Windows-Start.bat: Use core-win, fix syntax
- portable/Windows-Menu.bat: Use core-win, fix syntax
- portable/Mac-Start.command: Use core-mac
- portable/Mac-Menu.command: Use core-mac
- portable/setup.sh: Download both platforms, use core-mac

Files added:
- portable/Windows-Diagnose.bat: Diagnostic tool
- portable/Mac-Diagnose.command: Diagnostic tool
- portable/Welcome.html: User-friendly welcome page

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

portable/Windows-Diagnose.bat

@@ -0,0 +1,121 @@
+@echo off
+chcp 65001 >nul 2>&1
+title U-Claw - Diagnostic Tool
+
+set "UCLAW_DIR=%~dp0"
+set "LOG_FILE=%UCLAW_DIR%diagnostic-log.txt"
+
+echo.
+echo   ========================================
+echo     U-Claw Diagnostic Tool
+echo     诊断工具
+echo   ========================================
+echo.
+echo   Checking system... 正在检查系统...
+echo.
+
+REM Clear old log
+echo U-Claw Diagnostic Report > "%LOG_FILE%"
+echo Generated: %date% %time% >> "%LOG_FILE%"
+echo ======================================== >> "%LOG_FILE%"
+echo. >> "%LOG_FILE%"
+
+REM 1. Check Node.js
+echo [1/6] Checking Node.js runtime...
+set "NODE_BIN=%UCLAW_DIR%app\runtime\node-win-x64\node.exe"
+if exist "%NODE_BIN%" (
+    echo   [OK] Node.js found >> "%LOG_FILE%"
+    for /f "tokens=*" %%v in ('"%NODE_BIN%" --version 2^>^&1') do echo       Version: %%v >> "%LOG_FILE%"
+    echo   ✓ Node.js: Found
+) else (
+    echo   [ERROR] Node.js not found >> "%LOG_FILE%"
+    echo   [X] Node.js: NOT FOUND
+    echo       Path: %NODE_BIN% >> "%LOG_FILE%"
+)
+
+REM 2. Check core-win directory
+echo [2/6] Checking core-win directory...
+set "CORE_DIR=%UCLAW_DIR%app\core-win"
+if exist "%CORE_DIR%" (
+    echo   [OK] core-win directory exists >> "%LOG_FILE%"
+    echo   ✓ core-win: Found
+) else (
+    echo   [ERROR] core-win directory not found >> "%LOG_FILE%"
+    echo   [X] core-win: NOT FOUND
+)
+
+REM 3. Check node_modules
+echo [3/6] Checking dependencies...
+if exist "%CORE_DIR%\node_modules" (
+    echo   [OK] node_modules exists >> "%LOG_FILE%"
+    echo   ✓ Dependencies: Found
+) else (
+    echo   [ERROR] node_modules not found >> "%LOG_FILE%"
+    echo   [X] Dependencies: NOT FOUND
+)
+
+REM 4. Check OpenClaw
+echo [4/6] Checking OpenClaw...
+set "OPENCLAW_MJS=%CORE_DIR%\node_modules\openclaw\openclaw.mjs"
+if exist "%OPENCLAW_MJS%" (
+    echo   [OK] openclaw.mjs found >> "%LOG_FILE%"
+    echo   ✓ OpenClaw: Found
+) else (
+    echo   [ERROR] openclaw.mjs not found >> "%LOG_FILE%"
+    echo   [X] OpenClaw: NOT FOUND
+    echo       Path: %OPENCLAW_MJS% >> "%LOG_FILE%"
+)
+
+REM 5. Check port availability
+echo [5/6] Checking port 18789...
+netstat -an | findstr ":18789 " | findstr "LISTENING" >nul 2>&1
+if %errorlevel%==0 (
+    echo   [WARNING] Port 18789 is in use >> "%LOG_FILE%"
+    echo   ⚠ Port 18789: IN USE
+    netstat -ano | findstr ":18789 " >> "%LOG_FILE%"
+) else (
+    echo   [OK] Port 18789 is available >> "%LOG_FILE%"
+    echo   ✓ Port 18789: Available
+)
+
+REM 6. Test OpenClaw startup
+echo [6/6] Testing OpenClaw startup...
+echo. >> "%LOG_FILE%"
+echo Testing OpenClaw startup: >> "%LOG_FILE%"
+echo ---------------------------------------- >> "%LOG_FILE%"
+
+set "OPENCLAW_HOME=%UCLAW_DIR%data"
+set "OPENCLAW_STATE_DIR=%UCLAW_DIR%data\.openclaw"
+set "OPENCLAW_CONFIG_PATH=%OPENCLAW_STATE_DIR%\openclaw.json"
+
+if exist "%NODE_BIN%" if exist "%OPENCLAW_MJS%" (
+    cd /d "%CORE_DIR%"
+    "%NODE_BIN%" "%OPENCLAW_MJS%" --version >> "%LOG_FILE%" 2>&1
+    if %errorlevel%==0 (
+        echo   ✓ OpenClaw: Can run
+    ) else (
+        echo   [X] OpenClaw: Failed to run
+        echo   [ERROR] OpenClaw failed to start >> "%LOG_FILE%"
+    )
+) else (
+    echo   [X] Cannot test - files missing
+    echo   [SKIP] Cannot test - required files missing >> "%LOG_FILE%"
+)
+
+echo.
+echo. >> "%LOG_FILE%"
+echo ======================================== >> "%LOG_FILE%"
+echo Diagnostic complete. >> "%LOG_FILE%"
+
+echo   ========================================
+echo     Diagnostic Complete
+echo   ========================================
+echo.
+echo   Log saved to: diagnostic-log.txt
+echo.
+echo   Next steps:
+echo   1. Check diagnostic-log.txt for details
+echo   2. If errors found, try running Windows-Start.bat
+echo      to auto-install missing dependencies
+echo.
+pause